AMDGPU/GlobalISel: Fix assert on copy to vcc
This was trying to constrain a physical register. By the verifier's understanding, it's impossible to have a 1-bit copy to vcc/vcc_lo so don't try to handle physregs.
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This was trying to constrain a physical register. By the verifier's understanding, it's impossible to have a 1-bit copy to vcc/vcc_lo so don't try to handle physregs.